<template>
  <div class="header">
    <div class="nav-topbar">
      <div class="container">
        <div class="topbar-menu">
          <a href="javascript:;">小米商城</a>
          <a href="javascript:;">MIUI</a>
          <a href="javascript:;">云服务</a>
          <a href="javascript:;">协议规则</a>
        </div>
        <div class="topbar-user">
          <a href="javascript:;" v-if="username">欢迎您，{{username}}！</a>
          <a href="javascript:;" v-if="!username" @click="goToLogin">登录</a>
          <a href="javascript:;" v-if="username" @click="logout">退出</a>
          <a href="javascript:;" @click="goToOrder">我的订单</a>
          <a href="javascript:;" class="my-cart" @click="goToCart"><span class="icon-cart"></span>购物车({{cartCount}})</a>
        </div>
      </div>
    </div>
    <div class="nav-header">
      <div class="container">
        <div class="header-logo">
          <a href="/#/index"></a>
        </div>
        <div class="header-menu">
          <div class="item-menu">
            <span>小米手机</span>
            <div class="children">
              <ul>
                <li class="product" v-for="(item, index) in phoneList" :key="index">
                  <a :href="'/#/product/'+item.id" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="item.mainImage" :alt="item.subtitle">
                    </div>
                    <div class="pro-name">{{item.name}}</div>
                    <div class="pro-price">{{item.price | currency}}</div>
                  </a>
                </li>
              </ul>
            </div>
          </div>
          <div class="item-menu">
            <span>红米手机</span>
            <div class="children">
              <ul>
                <li class="product" v-for="(item, index) in redmiList" :key="index">
                  <a :href="'/#/product/'+item.id" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="item.mainImage" :alt="item.subtitle">
                    </div>
                    <div class="pro-name">{{item.name}}</div>
                    <div class="pro-price">{{item.price | currency}}</div>
                  </a>
                </li>
              </ul>
            </div>
          </div>
          <div class="item-menu">
            <span>电视</span>
            <div class="children">
              <ul>
                <li class="product">
                  <a href="" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="'/imgs/nav-img/nav-3-1.jpg'" alt="">
                    </div>
                    <div class="pro-name">小米</div>
                    <div class="pro-price">￥1799元</div>
                  </a>
                </li>
                <li class="product">
                  <a href="" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="'/imgs/nav-img/nav-3-2.jpg'" alt="">
                    </div>
                    <div class="pro-name">小米</div>
                    <div class="pro-price">￥1799元</div>
                  </a>
                </li>
                <li class="product">
                  <a href="" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="'/imgs/nav-img/nav-3-3.png'" alt="">
                    </div>
                    <div class="pro-name">小米</div>
                    <div class="pro-price">￥1799元</div>
                  </a>
                </li>
                <li class="product">
                  <a href="" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="'/imgs/nav-img/nav-3-4.jpg'" alt="">
                    </div>
                    <div class="pro-name">小米</div>
                    <div class="pro-price">￥1799元</div>
                  </a>
                </li>
                <li class="product">
                  <a href="" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="'/imgs/nav-img/nav-3-5.jpg'" alt="">
                    </div>
                    <div class="pro-name">小米</div>
                    <div class="pro-price">￥1799元</div>
                  </a>
                </li>
                <li class="product">
                  <a href="" target="_blank">
                    <div class="pro-img">
                      <img v-lazy="'/imgs/nav-img/nav-3-6.png'" alt="">
                    </div>
                    <div class="pro-name">小米</div>
                    <div class="pro-price">￥1799元</div>
                  </a>
                </li>
              </ul>
            </div>
          </div>
        </div>
        <div class="header-search">
          <div class="wapper">
            <input class="text" name="keyword"/>
            <a href="javascript:;"></a>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import { mapState } from 'vuex'
  export default {
    name: 'nav-header',
    data () {
      return {
        phoneList: [],
        redmiList: []
      }
    },
    computed: {
      // username () {
      //   return this.$store.state.username;
      // },
      // cartCount () {
      //   return this.$store.state.cartCount;
      // },
      ...mapState(['username', 'cartCount'])
    },
    mounted() {
      this.getProductList()
      // 从登录页面跳转过来才调用 否则在App.vue中已经调用 可以用导航守卫
      let params = this.$route.params;
      console.log(params)
      if(params && params.from === 'login') {
        console.log('登录调用')
        this.getCartCount()
      }
    },
    filters: {
      currency(val) {
        if(!val) {
          return '0.00'
        }
        return '￥'+val.toFixed(2) + '元'
      }
    },
    methods: {
      getProductList() {
        this.axios.get('/products', {
          params: {
            categoryId: '100012',
            // pageSize: 6
          }
        }).then((res) => {
          this.phoneList = res.list.slice(0,6)
          this.redmiList = res.list.slice(6,10)
        })
      },
      goToCart() {
        this.$router.push('/cart')
      },
      goToLogin() {
        this.$router.push('/login')
      },
      goToOrder() {
        this.$router.push('/order/list')
      },
      getCartCount () {
        this.axios({
          method:'get',
          url: '/carts/products/sum',
        }).then((res) => {
          this.$store.dispatch('saveCartCount', res)
        })
      },
      logout() {
        this.axios.post('/user/logout')
        .then(() => {
          this.$message.success('退出成功！')
          this.username = ''
          this.$cookie.set('userId', '', {expires: '-1'})// 即刻过期
          this.$store.dispatch('saveUserName', '');
          this.$store.dispatch('saveCartCount', 0);
        })
        .catch(err => {
          console.error(err); 
        })
      }
    },
  }
</script>

<style lang='scss'>
  @import '@/assets/scss/base.scss';
  @import '@/assets/scss/mixin.scss';
  @import '@/assets/scss/config.scss';
  .header {
    .nav-topbar {
      height: 39px;
      line-height: 39px;
      background-color: $colorB;
      color: #b0b0b0;
      .container {
        @include flex();
        a {
          display: inline-block;
          color: #b0b0b0;
          margin-right: 17px
        }
        .my-cart {
          width: 110px;
          background-color: $colorA;
          color: #ffffff;
          text-align: center;
          .icon-cart {
            @include bgImg(16px, 12px, '/imgs/icon-cart-checked.png');
            margin-right: 4px;
          }
          margin-right: 0;
        }
      }
    }
    .nav-header {
      .container {
        position: relative;
        height: 112px;
        @include flex();
        // .header-logo {
        //   display: inline-block;
        //   width: 55px;
        //   height: 55px;
        //   background-color: $colorA;
        //   a {
        //     display: inline-block;
        //     width: 110px;
        //     height: 55px;
        //     // 通过伪类加两张图片
        //     &:before {
        //       // 伪类占位
        //       content: '';
        //       transition: margin .3s;
        //       @include bgImg(55px, 55px, '/imgs/mi-logo.png', 55px);
        //     }
        //     &:after {
        //       content: '';
        //       @include bgImg(55px, 55px, '/imgs/mi-home.png', 55px);
        //     }
        //     &:hover:before {
        //       // 查看after的图片
        //       margin-left: -55px;
        //       transition: margin .3s;
        //     }
        //   }
        // }
        .header-menu {
          display: inline-block;
          width: 643px;
          padding-left: 209px;
          .item-menu {
            display: inline-block;
            color:$colorB;
            font-weight: bold;
            font-size: 16px;
            line-height: 112px;
            text-align: center;
            margin-right: 20px;
            span {
              cursor: pointer;
            }
            &:hover {
              color:$colorA;
              .children {
                z-index: 99;
                height: 220px;
                opacity: 1;
              }
            }
            .children {
              position: absolute;
              top: 112px;
              left: 0;
              width: 1226px;
              height: 0px;
              opacity: 0;
              border-top: 1px solid #e5e5e5;
              box-shadow: 0px 7px 6px 0px rgba(0,0,0,0.1);
              overflow: hidden;
              transition: height 1s;
              background-color: #ffffff;
              .product {
                position: relative;
                float: left;
                width: 16.6%;
                height: 220px;
                font-size: 12px;
                line-height: 12px;
                a {
                  display: inline-block;
                }
                img {
                  height: 111px;
                  width: auto;
                  margin-top: 26px;
                }
                .pro-img {
                  height: 137px;
                }
                .pro-name {
                  font-weight: bold;
                  margin-top: 19px;
                  margin-bottom: 8px;
                  color: $colorB;
                }
                .pro-price {
                  color: $colorA;
                }
                &::before {
                  content: '';
                  position: absolute;
                  top: 28px;
                  right: 0;
                  border-left: 1px solid $colorF;
                  height: 100px;
                  width: 1px;
                }
                &:last-child::before {
                  display: none;
                }
              }
            }
          }
        }
        .header-search {
          width: 319px;
          .wapper {
            height: 50px;
            border: 1px solid #e0e0e0;
            display: flex;
            align-items: center;
            input {
              border: none;
              border-right: 1px solid #e0e0e0;
              width: 264px;
              height: 50px;
              padding-left: 10px;
              box-sizing: border-box;
            }
            a {
              margin-left: 17px;
              @include bgImg(18px, 18px, '/imgs/icon-search.png');
            }
          }
        }
      }
    }
  }
</style>
